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Build Infinite Scroll

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01

Understand the problem

Build a list that loads more items as the user scrolls to the bottom.

ReactIntersectionObserverAsync
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

Study the solution

Solve in

Building Infinite Scroll in React

Mental model: Render a list plus a sentinel element at the bottom. An IntersectionObserver watches the sentinel; when it scrolls into view, load the next page and append. This beats scroll-event math — the browser tells you exactly when the bottom is near.

Step 1 — Pag

Solution ready — 2 min read

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04

React solution

Complete solutionRun Playground
import React from 'react';
import InfiniteScroll from './src/InfiniteScroll';

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Infinite Scroll Demo</h1>
      <InfiniteScroll />
    </div>
  );
}
05

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Dossier 49 of 87 decoded in the Frontend Machine Coding track. One more won't hurt.

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